linux-kernel - Re: [PATCH] drm/amd/display: return status of dmub_srv_get_fw_boot

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Date:   Mon, 24 Apr 2023 13:02:14 -0400
From:   Hamza Mahfooz <hamza.mahfooz@....com>
To:     Tom Rix <trix@...hat.com>, harry.wentland@....com,
        sunpeng.li@....com, Rodrigo.Siqueira@....com,
        alexander.deucher@....com, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch,
        Alvin.Lee2@....com, Jun.Lei@....com, qingqing.zhuo@....com,
        Max.Tseng@....com, Josip.Pavic@....com, Eric.Yang2@....com,
        aurabindo.pillai@....com
Cc:     dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amd/display: return status of
 dmub_srv_get_fw_boot_status


On 4/20/23 09:59, Tom Rix wrote:
> gcc with W=1 reports
> drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:
>    In function ‘dc_dmub_srv_optimized_init_done’:
> drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:184:26:
>    error: variable ‘dmub’ set but not used [-Werror=unused-but-set-variable]
>    184 |         struct dmub_srv *dmub;
>        |                          ^~~~
> 
> The return status is never set.
> It looks like a call to dmub_srv_get_fw_boot_status is missing.
> 
> Fixes: 499e4b1c722e ("drm/amd/display: add mechanism to skip DCN init")

What tree is this based on? I am unable to find that exact commit on
amd-staging-drm-next.

> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>   drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c | 13 +++++++++++--
>   1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
> index d15ec32243e2..36d936ab4300 100644
> --- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
> +++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
> @@ -182,14 +182,23 @@ bool dc_dmub_srv_cmd_run_list(struct dc_dmub_srv *dc_dmub_srv, unsigned int coun
>   bool dc_dmub_srv_optimized_init_done(struct dc_dmub_srv *dc_dmub_srv)
>   {
>   	struct dmub_srv *dmub;
> -	union dmub_fw_boot_status status;
> +	struct dc_context *dc_ctx;
> +	union dmub_fw_boot_status boot_status;
> +	enum dmub_status status;
>   
>   	if (!dc_dmub_srv || !dc_dmub_srv->dmub)
>   		return false;
>   
>   	dmub = dc_dmub_srv->dmub;
> +	dc_ctx = dc_dmub_srv->ctx;
> +
> +	status = dmub_srv_get_fw_boot_status(dmub, &boot_status);
> +	if (status != DMUB_STATUS_OK) {
> +		DC_ERROR("Error querying DMUB boot status: error=%d\n", status);
> +		return false;
> +	}
>   
> -	return status.bits.optimized_init_done;
> +	return boot_status.bits.optimized_init_done;
>   }
>   
>   bool dc_dmub_srv_notify_stream_mask(struct dc_dmub_srv *dc_dmub_srv,
-- 
Hamza